Abstract: A data processing apparatus includes a preread data acquisition unit that reads a document with preread setting, and acquires preread data including plural preread page data; and a main processing data generation unit that generates main processing data on the basis of main read setting applied to main processing on the document, the preread setting, and a document property of each page of the document acquired by analyzing the preread data, by using, for a page with corresponding one of the preread page data satisfying the main read setting, the corresponding preread page data, and by using main read page data acquired by reading the document with the main read setting for a page with corresponding one of the preread page data not satisfying the main read setting, among pages included in the document.

Abstract: An image projection apparatus includes a light source; a projected image outputting unit having multiple mirrors arranged in a matrix, to which radiating light emitted from the light source while controlling an angle of a light reflection face of each of the mirrors; a control unit controls the angle of light reflection face of the mirrors using the a division half-toning control based on image data of a projected image, and settings of control parameters used for the time division half-toning control; and an image capturing device to capture the projected mage. When the control unit detects a false contour in a projected test pattern image based on image data of the projected test pattern image captured by the image capturing device, the control unit corrects the control parameters for the time division half-toning control based on detection of the false contour.

Abstract: A phosphor wheel includes a glass, a first phosphor agent and a first filter. The glass has a first region and the first phosphor agent is coated on the first region for converting a first color light into a second color light. The first filter is disposed next to the first region for filtering at least a portion of the first color light and a first light beam of the second color light, so that a second light beam of the second color light is transmitted through the first filter. The second color light is yellow light, the first phosphor agent is yellow phosphor agent, and the first filter is a red light filter. The present invention achieves the advantages of decreasing the fabricating cost, increasing the brightness of the red light with increasing of driving current and the whole brightness of the illumination system, and improving the image quality.

Abstract: An image projection apparatus includes a light source; a projected image outputting unit having multiple mirrors arranged in a matrix, to which radiating light emitted from the light source while controlling an angle of a light reflection face of each of the mirrors; a control unit controls the angle of light reflection face of the mirrors using the a division half-toning control based on image data of a projected image, and settings of control parameters used for the time division half-toning control; and an image capturing device to capture the projected mage. When the control unit detects a false contour in a projected test pattern image based on image data of the projected test pattern image captured by the image capturing device, the control unit corrects the control parameters for the time division half-toning control based on detection of the false contour.

Abstract: A scan assisting fixing device and a scanner using the same are provided. The fixing device is for fixing an object to be scanned, which includes a scanning portion and a holding portion. The fixing device includes an accommodation region, a scan window and a protrusion portion. When the holding portion is loaded in the accommodation region, the scanning portion correspondingly disposed in the scan window is retained and fixed by the protrusion portion, and the position of the holding portion in the fixing device is constant, so that the scanning portion is always within the range of the field depth of the scanner regardless of the specification of the positive film holder, and the clarity of the scanned image is assured.

Abstract: A projection apparatus includes a shutter mechanism to prevent light from reaching an image plane during calibration of light sources. The shutter mechanism may include liquid crystal material that exhibits an effective index of refraction that varies with applied voltage. During calibration, a light beam is shuttered, light sources are driven by calibration data, and optical power is measured.

Abstract: A projection assembly is arranged to be added onto or built into at least one LED-unit or other light-unit of an illuminated object that has more than one LED or other light source to cause the object to be illuminated and show the object's design or appearance while also offering illumination to people. The illuminated object may include all kinds of seasonal lighting, regular light fixtures, track lights, desktop lights, and battery operated lights having more than one light-unit or LED-unit.

Abstract: An illumination system for providing an illumination beam to a light valve is provided. The illumination system includes a light source, a light integration rod, a color wheel, a first focusing unit and a second focusing unit. The light source is capable of generating the illumination beam, and the light integration rod is disposed on the transmission path of the illumination beam. The first focusing unit is disposed between the integration rod and the color wheel and is capable of focusing the illumination beam onto the color wheel. The second focusing unit is disposed between the color wheel and the light valve and is capable of focusing the illumination beam onto the light valve.

Abstract: A projection device embodiment comprises a light source system, a gate with a cross sectional gate area, and projection optics. The light source system includes a solid-state light source configured to provide light, and light source optics. The light source optics are configured to distribute light from the solid-state light source across the gate area of the gate. The gate is configured to be used to produce an object to be imaged by the projection device. The projection optics is configured to project an image of the object.

Abstract: A projector includes a projecting module for projecting a projecting image on a screen panel, an image sensor for capturing an image of an object which is located outside of the projecting module and faces toward the lens module, a light director, and a controlling unit. The projecting module has a lens module and a light source for emitting light transmitting through the lens module. The light director is movable between a first position where the light director is located outside of a light path associated with the lens module, and a second position where the light director is configured for directing light of the object through the lens module to be incident on the image sensor. The controlling unit controls the light director to move between the first and second positions.

Abstract: A projector having a housing containing an electrical light source, an image medium support aligned in the light path of the light source, and a lens through which light emanating from the light source exits the housing after passing through an image medium disposed in the image medium support.

Abstract: An image projector that drops into the accessory slot of a luminaire and projects high quality images printed on plastic slides in full color and photographic detail for extended time periods without heat degradation. The projector comprises a cooling fan, infrared and ultraviolet light filter means, and an inexpensive and removable slide assembly comprising a plastic image slide, a protective film slide and at least one mounting plate. The cooling fan is combined with layered, reflective filters to create a protected environment for the plastic image slide to survive the extreme heat at the gate of today's efficient luminaires. The plastic image slide is created on a plastic sheet using conventional computer printing technologies.

Abstract: A film scanning device using the same CCD light sensor for pictures of strip film and for a slide mount also comprises a body having a strip film transport path disposed there through. The transport path has a first opening in the body for inserting a developed strip film, a second opening in the body through which the developed strip film exits the body, and a third opening for inserting and pulling out a slide mount juxtaposed vertically relative to the strip film transport path.

Abstract: A dual mode laser projection system having a film mode and an electronic mode that can be used to project an image onto a screen. In the film mode an image is projected by illuminating film with lasers, and in the electronic mode an image is created by modulation of with lasers with data to project an electronic image. The laser source may comprise a plurality of lasers each providing a different color, such as red, green, and blue. Laser-CRTs may be used. In some embodiments the laser source is synchronized with the film aperture so that the laser source is modulated to illuminate the film aperture only while a frame of the film is stopped. In some embodiments the color temperature of the light illuminating the film can be selected by increasing and/or decreasing the relative light intensity contribution of each of the lasers.

Abstract: A system for compensating for film flutter in a motion picture film projector during projection of a motion picture film comprising multiple film image frames is described, the system comprising sensing the position of film image frames in a film gate of the projector relative to the focal plane of the projection lens assembly of the projector as the film image frames are being projected, and correcting the position of the film in the film gate of the projector or the position of the focal plane of the projection lens assembly to reduce the distance between the film image and the focal plane of the projection lens assembly as the film image frames are being projected, wherein the correction of the position of an individual film image frame in the film gate or that of the position of the focal plane of the projection lens assembly during projection of the individual frame image is based on the actual sensed position of the individual film image frame in the film gate, or on the position of a previously project

Abstract: A rotary gate for digitally scanning frames of a motion picture film has a motor drive wheel and a coaxially spaced free wheel which support and engage sprocket holes in the film. The free wheel has no connection to the driven wheel other than the film which rotates the free wheel as it is driven by the drive wheel for advancing the film through the gate. A light source and sensor are provided on opposite sides of the film for illuminating the film and digitally scanning motion picture frames. Sprockets on the drive wheel are profiled to stabilize the film laterally while it is advanced for scanning of each frame. A fixed disc with a smooth track my be substituted for the free wheel for supporting the film.

Abstract: An image input apparatus with a main unit; a film holding adaptor, freely attachable or detachable to or from the main unit, for holding a film; a carriage for holding an illuminator for illuminating a film held in the film holding adaptor and an imaging unit for imaging the film illuminated by the illuminator; and an adaptor mount formed on the carriage and engaged with the film holding adaptor.

Abstract: A removable cover for protecting a reticle used in a lithography system is described. The removable cover includes a frame and a membrane supported by the frame. The membrane is transparent to an inspection wavelength such that the reticle can be inspected with the removable cover in place. This removable cover protects the reticle when the removable cover is in place and is removable for lithographic exposure. The removable cover can further include at least one reticle fastener that applies force to the reticle thereby preventing movement of the removable cover relative to the reticle when the removable cover is in place. A plurality of fasteners are used to position and secure the removable cover and reticle. A method of performing lithography and a lithographic system are also described.

Abstract: A film projector for use with processed photographic film having magnetically recorded image information. The film projector has a body and a light source disposed in the body. The light source emits a collimated beam. A film holder is mounted in the body. The film holder is disposed to hold an individual frame of film in the beam. A projection lens system receives the beam propagated through the film. An optically transmissive digital display element is disposed in said body. A read-write unit is disposed to read annotation information from and write annotation information to the film in the film holder. A controller is operatively connected to the read-write unit and the display element. The controller modulates the display element responsive to the signal.

Abstract: An improved image input apparatus 1 prevents foreign particles from attaching onto image reading areas of transparency media contained within the apparatus by providing feeding block structure 13 that substantially covers an area between a loading cartridge 11 and a take-up housing 15, except for a small slit-shaped window 13a formed in block 13 in a direction intersecting a direction of movement of the media through the block. The window 13a preferably has a sloping part 13d inclined toward a light axis L1 of an illumination system 12 that passes through the transparency media. The feeding block 13 may also be provided with a pressing member 13b that acts with rails 13c to press on the transparency media and prevent curling.

Abstract: A film viewer into which is loaded a cartridge which has a spool for taking up a film, a door provided at a film entrance/exit, and an engagement shaft for opening and closing the door, the film viewer being used to view a film which is wound on the spool and removed from the cartridge, the film viewer including: a cartridge accommodating portion which accommodates the cartridge; a rotating shaft provided in the cartridge accommodating portion and engaging the spool when the cartridge is accommodated into the cartridge accommodating portion; a film accommodating portion which accommodates the film removed from the cartridge; and a window portion provided between the cartridge accommodating portion and the film accommodating portion, the film being viewable through the window portion.

Abstract: Orientation of a removable film gate with a docking frame is accomplished by a releasable locator connector assembly in conjunction with a force-responsive clamp assembly. The locator connector assembly includes a male connector subassembly on the removable film gate and a female connector subassembly located on the docking frame. A spring-biased threaded screw in the male connector subassembly connects with a tapped end of a locator pin in the female connector subassembly. The threaded screw and tapped locator pin locate each other by a cone-shaped protrusion at the top of the locator pin in conjunction with a recessed area of a locator seat within the male connector subassembly. The force-responsive clamp assembly accepts a tab of the removable film gate when the film gate is pushed into the photographic film printer, and releases the tab when a pulling force is applied to the film gate.

Abstract: A film scanner for digitizing film image frames having dual, in-line negative filmstrip and slide scanning gates on a scanning gate frame movable to position the selected scanning gate in a scanning station. The film scanner includes a film scanning station, an insertion slot for receiving the filmstrip, a filmstrip pre-positioning station a filmstrip for scanning while a previous filmstrip is being scanned, an ejection slot, and a diverter for diverting the scanned filmstrip out the ejection slot and allowing the advancement of the pre-positioned filmstrip into the filmstrip scanning gate. The pre-positioned filmstrip is advanced in a forward direction through the diverter and filmstrip scanning gate, as the scanning station performs a low resolution pre-scanning of the image frames.

Abstract: A slide projector for both front and rear projection includes a shallow lens tunnel for mounting a simple wide-angle lens. In a first aspect, a second lens port is added to a conventional slide projector designed for front projection. A mirror pivots to invert and direct light rays from an illuminated slide to the simple wide-angle lens. In a second aspect, only the shallow lens tunnel is present and a rotating slide gate orients the slide, depending on operation in front or rear projection mode. Front projection in the second aspect requires a lens tunnel extension.

Abstract: An apparatus for driving a scanning gate of a photographic film scanning apparatus utilizes a reversible m s , stepping motor, and a system driven by the motor for moving the gate in a pendulum-like manner. The means comprises a shaft, a gear sector fixedly connected on the shaft and a crank arm fixedly connected on the shaft so as to operatively engage the scanning gate, and a worm configured to be driven by the motor. A biasing device is arranged between the gear sector and a chassis of the scanning apparatus to maintain a positive engagement between the worm and the gear sector. Additional biasing devices are connected between the crank arm and the gate to provide for adjustment of the gate about two axes.

Abstract: A chassis for mounting components in a photographic film scanning apparatus cabinet includes a planar base member, and bearing mounts integral with the base member. The mounts sized and configured to hold bearings against which an arcuate wear plate of a gate of the scanning apparatus registers. The gate is configured to move in a pendulum-like manner across the bearings, with an aperture in the planar member for rotatably accommodating a shaft of a drive system for moving the gate in the pendulum-like manner. Mounts integral with the planar base member are provided for holding an optical system of the scanning apparatus. A continuous integral rib is arranged on the rear surface of the planar member is tuned to a higher natural frequency than that of the scanning frequency for vibrationally isolating the planar base member from other components in the cabinet.

Abstract: The overhead projector include a lower plate disposed on a housing of a main body of the overhead projector. The lower plate can rotate about a light axis of a condenser lens and has a transparent portion facing at least the condenser lens. A projection lens is supported above the condenser lens and an upper plate is disposed under the projection lens. The upper plate is supported vertically resiliently with respect to the projection lens and has a transparent portion at least facing the condenser lens. The upper plate is able to rotate about a light axis of the condenser lens. When images projected on a screen lie sideways or upside down, the upper and lower plates which are interposing a film therebetween are rotated. Thus, the directions of the projected images are correctly adjusted.

Abstract: Projector comprising a housing, a support frame formed with a carrying surface for carrying a flexible file sheet in which transparent materials are arranged in the form of a matrix longitudinally and transversely, light source device arranged in the housing at one side of the support frame, projecting lens device arranged at the other side of the support frame, the support frame being mounted on the housing for a reciprocating movement in a first direction, the support frame being provided with guide rails for movably carrying the file sheet in a second direction perpendicular to the first direction. The projector further comprises retaining device for retaining the file sheet onto the carrying surface. The retaining device is mounted on the support frame for slidable or rotatable movement relative to the file sheet so that the transparent material can be easily changed in the file sheet without focus readjustment.

Abstract: Apparatus is described for the detailed viewing of a strip of 35 mm slide film which is enclosed in a transparent jacket. The apparatus includes a projector with a film gate which is wide enough to pass the jacket, and which projects sufficient area to include the frame number which lies under each picture frame. The apparatus enables a person to view the details of a developed roll of slide film, in its jacket, and to select particular frames for making prints or mounted slides.

Abstract: In a method of establishing and writing a pattern which, when placed in a light beam from a projector, produces an illuminated area of any shape and size displayed on a screen, a reference point is defined which, when projected onto the screen, forms a contrasted light area thereon. The reference point is moved in the light beam so that its trajectory defines an illuminated area of required shape displaying this movement. This trajectory is written onto a pattern storage device simultaneously with or subsequently to movement of the reference point. The device for implementing this method comprises a plate incorporating a plurality of writable locations, a displacement device for moving from location to location, a pattern defining device, a memorizing device and a pattern writing device. The method and device are primarily intended for use in the theatre and entertainment for producing luminous decorative effects and luminous areas related to the decor, objects and persons in the projection space.

Abstract: Apparatus (10) for positioning film media (30, 50) in alignment with a video imager includes a frame having a window (28), a primary gate (12) mounted on the frame for holding film media in a first plane, a secondary gate (13) mounted on the frame for holding film media in a second plane, and a sensor (14) for detecting the presence or absence of film media whereby the video imager is caused to move with respect to the primary and secondary gates to focus on the film media. A carrier (61) comprising a base (80) and cover (81) is provided with a channel (83) for filmstrips (50). The base and cover snap together for the removal and insertion of filmstrips. A plurality of notches (78) are associated with each frame (76) for accurate positioning of the filmstrip.

Abstract: In a liquid crystal projector wherein a light source is arranged behind a transmission liquid crystal display panel having a rectangular display portion, an image displayed on the liquid crystal display panel is enlarged by a projection lens, and an enlarged image is projected on the screen located in front of the liquid crystal display panel, a linear Fresnel lens is arranged between the light source and the liquid crystal display panel to narrow illumination light beam from the light source along only the widthwise direction of the rectangular display portion. When the illumination light beam from the light source is narrowed along only the widthwise direction of panel, the amount of unused light beam emitted outside the long sides of the display portion can be reduced, and the light beam from the light source can be effectively utilized for image projection.

Abstract: A film carrier support mechanism for a film projector of the type having an upper cylindrical member for accommodating a light source, and a lower cylindrical member for accommodating an optical arrangement for projection. The light source is adapted to project a picture stored in any of multiple frames of a film. A support member is interposed between the upper and lower bodies for supporting a film carrier, which receives therein a film to be projected, such that the film carrier is movable in a two-dimensional direction in a plane which is perpendicular to the optical axis of the optical arrangement. The support member includes guide elements which cooperate with the film carrier to guide the film carrier in a lengthwise direction of the film, while the film carrier is in a predetermined position with respect to a direction perpendicular to a lengthwise direction thereof.

Abstract: A folding slide viewer has a rear projection screen which swings into a ft position for storage. In a second, operating position, the projection screen it is provided with a lightproof bellows. The optical axis of the lens system is inclined at an angle with respect to the horizontal base of the housing. A reflector is along the optical axis of the lens system, when the screen is in its operating position, to reflect an image onto the screen. An image trap is swingable between a first position perpendicular to a longitudinal axis of the slide magazine and a second position perpendicular to the optical axis of the lens system.

Abstract: This invention is disclosed to a simulated key that contains important personal and medical information on a microfiche chip (46) enclosed within an information cartridge (32) that is selectively stored within the cover (10) that gives the key its appearance. The information cartridge has a handle (26) with a distinctive aperture (27) and stylized letters (12) to provide a skeleton key appearance yet to clearly disclose to trained medical and emergency personnel the information content of the key. A cartridge placement holder (47) also is provided to align the microfiche chip with the optical and magnification apparatus of conventional microfiche reading apparatus.

Abstract: A transparent contoured support plate for use in a printing gate is disclosed which comprises a transparent glass or plastic plate having a smoothly contoured raised central area. This contoured raised area is intended to support the central area of a flexible photographic material, the edges of which are constrained by a mount having an open aperture.

Abstract: A device for positioning a film set to a mount in an image printing apparatus comprises several elements. A movable member moves the mount in a direction parallel to a light axis of an optical printing system. A film positioning member, made of a light permeable material, is secured to a casing at a position between the film set in the mount and a light source for setting a film reference position in the optical printing system. Thus, the film is intimately contacted by the film positioning member at the film reference position when the movable member is moved towards the film positioning member during an image printing operation of the apparatus.

Abstract: The specification discloses a slide mount which may be used in a conventional slide projector enabling the film transparency to be rotated during image projection. More particularly, the mount comprises a body to be stationarily supported in the projector and a film-supporting assembly rotatably supported by the body. The film-supporting assembly is engageable at one edge of the body by a rotatable driving mechanism. Preferably, the film-supporting assembly is registered against the body in a direction perpendicular to the film to provide critical focus for the film.

Abstract: The invention relates to a device at a slide projector for adjusting the slide guide in a plane perpendicular to the optical axis (A--A) of the projector. First fixing means (6-8) are provided to connect a central portion of a first side of the slide guide (2) to the projector. Second and third fixing means (9-15) are located separated from each other on a side of the slide guide (2) opposed to said first side to connect the slide guide to the projector, which second and third fixing means (9-15) are capable to independently of each other adjust and fix the slide guide in the direction of the optical axis (A--A).

Abstract: The slide projector includes side-by-side image-projection systems and a circular slide tray, with slides passing in operation directly between the slide tray and either of two slide gates, the slide gates moving between a first position in which slides are acquired and released, and a second position in which slides are projected onto a screen. A slide lifter, a slide tray lock, slide clamps on each slide gate, and the slide gates are operated in a particular sequence relative to the movement of the slide tray to insure proper handling of the slides in the projector. The slide tray fits on a central hub which in turn is independently driven. Sensors are provided to continuously detect the position of the lifter, the slide gates, and the slide tray. A front end assembly which incorporates lenses which move laterally and vertically, with the longitudinal axes of the lenses remaining parallel at all times, provides precise image alignment, including image overlap and separation.

Abstract: A display terminal is provided which holds a roll of film, and can project the image of any film frame onto a console screen. The need for a platen to precisely locate a frame on the optical imaging plane, is avoided by keeping the film in tension. The tension is maintained while the film is stationary, by utilizing a pair of reel-driving motors that each provide a torque that varies with the diameter of the film roll on the corresponding reel. The film region being projected, can be held in a slight curve to more reliably hold all areas of the projected film region near a predetermined film plane. A film identification track and clock track can extend along one edge of the film to identify every frame and accurately center the frame at the imaging, or projection, station. The film can be rapidly moved to bring a desired frame to approximately the imaging station, with slight overshoot, and the film then can be inched back to center the frame.

Abstract: A film guide assembly for a film viewing device which projects an image provided on a film. The assembly includes a film transporting path having a window disposed therein for the delimitation of the edges of the image on the film and for defining the position of the film, the width of the opening of the window transverse to the direction of the film transporting path being smaller than the width of the film transporting path. The film guide assembly further includes first and second frame members which are arranged one behind the other in the direction of the travel of light through the window and enclose between them the film transporting path. The first frame member contacts the edges of the film and defines a contact plane which includes the window plane determinative for the sharpness of the projected image. The second frame member has a projection which projects in the direction of the contact plane defined by the first frame member.

Abstract: The film reader has a substantially cubic housing one wall of which is formed with a projection screen, an intake slot for a film to be projected, a focus control knob and two slots for position control levers movable along mutually normal axes near the screen. The transmission means between a film holder and respective control levers include a longitudinal carriage movable on two guiding tracks along one axis and supporting a transverse carriage for a transverse movement along the other axis. Each lever is pivotable about a fixed pivot point in mutually normal planes and is provided with an equalizing lever cooperating with a pin and slot guide. One control lever has an equalizing elbow lever hinged to a transmission lever extending transversely to the control lever and coupled to one side of the longitudinal carriage. The other control lever is coupled to the transverse carriage which supports the film by means of a closed loop Bowden wire.

Abstract: A hand-held transparency projector includes a housing having a recess formed in the housing for carrying a film cartridge, and a projection aperture in one end of the housing through which the images on the film in the cartridge may be projected. The housing carries a film-driving mechanism for advancing the film within the cartridge past the projection aperture when the cartridge is carried within the recess of the projector. The film-driving mechanism includes a claw mounted for slidable forward and return movements within the housing, the claw engaging perforations in the film at the end of the forward movement and advancing the film during the return movement in discrete steps of one frame.

Abstract: A compact film viewer for film strips of various sizes including a removable channel guide with a central opening disposed transverse a case between a light source and a lens and a film channel interchangeably received in the channel guide for slidably receiving film strips. The film channel is sized for a particular film and has a central opening corresponding to film frame size to prevent passage of excess light from the light source to the lens when viewing the film.

Abstract: A compact, smoothly operating, X-Y positioning mechanism for use in microfiche projecting apparatus is disclosed. The positioning mechanism occupies an area substantially the same size as one microfiche, however is displaceable over an area approximately four times as large. Smooth translation of the positioning mechanism is provided by two pairs of parallel rollers, the rollers of one pair being disposed perpendicularly to the other pair to allow for positioning in any direction.

Abstract: Microfilm carried by a microfilm carrier is moved in a horizontal plane so that a selected area of the microfilm is presented to a film aperture of a microform printing system. The microfilm carrier includes a sliding spacer fixed thereto sliding along a base plate in which the film aperture is formed. The sliding spacer maintains a predetermined distance between the carrier and the base plate during movement of the carrier.

Abstract: A photographic film like a microfilm is maintained on a focal plane by suction. A film support having a vacuum suction holes is made of a drafty material to allow draft while the film is maintained flat on the surface thereof by suction. Further, the film support has cushion to protect the film from scratches. Thus, the film can be fed on while being kept flat on a focal plane on the film support.

Abstract: Apparatus for positioning sheet-like or strip-shaped originals in a photographic copying machine has a horizontal table with a large window for transmission of copying light and a removable or exchangeable holder on the table. The holder has a lower section which rests on the table and has a first opening in register with the window, an upper section one marginal portion of which is pivoted to the corresponding marginal portion of the lower section, which is movable to and from an operative position of overlap with the lower section and which has a second opening in register with the first opening when the upper section assumes its operative position, and an elastic hold-down device which is affixed to the upper side of the lower section and has an open-sided cutout in register with the first opening.

Abstract: A flat receptacle to be mounted on a photographic enlarger to receive negative carriers. The receptacle has openings in the top and bottom walls to enable passage of light and a slot in one side wall enables insertion of a negative carrier. Means, such as holes in the bottom wall, interlock with complementary pins or the like on the bellows. The light source housing is lowered to clamp the receptacle in place for extended use, and the negatives may be inserted in the slotted side wall without raising and lowering the lamp house.